ABSTRACT Name : Nemo Oriza Student No : 1306102020072 Study Program : English Education Title : Investigating Linguistic Performance of Devayan Children Speakers Toward Their Indigenous Language Keywords: Linguistic Performance, Linguistic Competence, Devayan The objective of this research is to find out how the linguistic performance of Devayan children speaker toward their indigenous language employed by Chomsky (2006). The subject of this research was 15 children age from 9-11 who lived in Awe Seubal, a village in Simeulue Island. A case study method was undertaken by conducting tests, interviewing them, and observing their activities in order to attain the needed data in this study. The result of instruments showed that most of the children maintain a good performance toward their indigenous language by keep using it in daily activities, speak with it correctly, and to choose Devayan than Bahasa while playing among them. Meanwhile, some of parents and neighbors using Bahasa to communicate with the children come as a problem to the existence of the language. In conclusion, the use linguistic performance of Devayan children speakers toward their indigenous language are considerably as good as a native should be.